package com.gooseeker.util;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import net.sf.ezmorph.object.DateMorpher;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;
import net.sf.json.util.JSONUtils;


public class JsonUtil
{

    /**
     * 从一个JSON 对象字符格式中得到一个java对象，形如： {"id" : idValue, "name" : nameValue,
     * "aBean" : {"aBeanId" : aBeanIdValue, ...}}
     * 
     * @param object
     * @param clazz
     * @return
     */
    @SuppressWarnings("rawtypes")
    public static Object getDTO(String jsonString, Class clazz)
    {
        JSONObject jsonObject = null;
        try
        {
            setDataFormat2JAVA();
            jsonObject = JSONObject.fromObject(jsonString);
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        return JSONObject.toBean(jsonObject, clazz);
    }

    /**
     * 从一个JSON 对象字符格式中得到一个java对象，其中beansList是一类的集合，形如： {"id" : idValue, "name" :
     * nameValue, "aBean" : {"aBeanId" : aBeanIdValue, ...}, beansList:[{}, {},
     * ...]}
     * 
     * @param jsonString
     * @param clazz
     * @param map
     *            集合属性的类型 (key : 集合属性名, value : 集合属性类型class) eg: ("beansList" :
     *            Bean.class)
     * @return
     */
    @SuppressWarnings("rawtypes")
    public static Object getDTO(String jsonString, Class clazz, Map map)
    {
        JSONObject jsonObject = null;
        try
        {
            setDataFormat2JAVA();
            jsonObject = JSONObject.fromObject(jsonString);
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        return JSONObject.toBean(jsonObject, clazz, map);
    }

    /**
     * 从一个JSON数组得到一个java对象数组，形如： [{"id" : idValue, "name" : nameValue}, {"id" :
     * idValue, "name" : nameValue}, ...]
     * 
     * @param object
     * @param clazz
     * @return
     */
    @SuppressWarnings("rawtypes")
    public static Object[] getDTOArray(String jsonString, Class clazz)
    {
        setDataFormat2JAVA();
        JSONArray array = JSONArray.fromObject(jsonString);
        Object[] obj = new Object[array.size()];
        for (int i = 0; i < array.size(); i++)
        {
            JSONObject jsonObject = array.getJSONObject(i);
            obj[i] = JSONObject.toBean(jsonObject, clazz);
        }
        return obj;
    }

    /**
     * 从一个JSON数组得到一个java对象数组，形如： [{"id" : idValue, "name" : nameValue}, {"id" :
     * idValue, "name" : nameValue}, ...]
     * 
     * @param object
     * @param clazz
     * @param map
     * @return
     */
    @SuppressWarnings("rawtypes")
    public static Object[] getDTOArray(String jsonString, Class clazz, Map map)
    {
        setDataFormat2JAVA();
        JSONArray array = JSONArray.fromObject(jsonString);
        Object[] obj = new Object[array.size()];
        for (int i = 0; i < array.size(); i++)
        {
            JSONObject jsonObject = array.getJSONObject(i);
            obj[i] = JSONObject.toBean(jsonObject, clazz, map);
        }
        return obj;
    }

    /**
     * 从一个JSON数组得到一个java对象集合
     * 
     * @param object
     * @param clazz
     * @return
     */
    @SuppressWarnings({"rawtypes", "unchecked"})
    public static List getDTOList(String jsonString, Class clazz)
    {
        setDataFormat2JAVA();
        JSONArray array = JSONArray.fromObject(jsonString);
        List list = new ArrayList();
        for (Iterator iter = array.iterator(); iter.hasNext();)
        {
            JSONObject jsonObject = (JSONObject) iter.next();
            list.add(JSONObject.toBean(jsonObject, clazz));
        }
        return list;
    }

    /**
     * 从一个JSON数组得到一个java对象集合，其中对象中包含有集合属性
     * 
     * @param object
     * @param clazz
     * @param map
     *            集合属性的类型
     * @return
     */
    @SuppressWarnings({"rawtypes", "unchecked"})
    public static List getDTOList(String jsonString, Class clazz, Map map)
    {
        setDataFormat2JAVA();
        JSONArray array = JSONArray.fromObject(jsonString);
        List list = new ArrayList();
        for (Iterator iter = array.iterator(); iter.hasNext();)
        {
            JSONObject jsonObject = (JSONObject) iter.next();
            list.add(JSONObject.toBean(jsonObject, clazz, map));
        }
        return list;
    }

    /**
     * 从json HASH表达式中获取一个map，该map支持嵌套功能 形如：{"id" : "johncon", "name" : "小强"}
     * 注意commons
     * -collections版本，必须包含org.apache.commons.collections.map.MultiKeyMap
     * 
     * @param object
     * @return
     */
    @SuppressWarnings({"rawtypes", "unchecked"})
    public static Map getMapFromJson(String jsonString)
    {
        setDataFormat2JAVA();
        JSONObject jsonObject = JSONObject.fromObject(jsonString);
        Map map = new HashMap();
        for (Iterator iter = jsonObject.keys(); iter.hasNext();)
        {
            String key = (String) iter.next();
            map.put(key, jsonObject.get(key));
        }
        return map;
    }

    /**
     * 从json数组中得到相应java数组 json形如：["123", "456"]
     * 
     * @param jsonString
     * @return
     */
    public static Object[] getObjectArrayFromJson(String jsonString)
    {
        JSONArray jsonArray = JSONArray.fromObject(jsonString);
        return jsonArray.toArray();
    }

    /**
     * 把数据对象转换成json字符串 DTO对象形如：{"id" : idValue, "name" : nameValue, ...}
     * 数组对象形如：[{}, {}, {}, ...] map对象形如：{key1 : {"id" : idValue, "name" :
     * nameValue, ...}, key2 : {}, ...}
     * 
     * @param object
     * @return
     */
    public static String getJSONString(Object object) throws Exception
    {
        String jsonString = null;
        // 日期值处理器
        JsonConfig jsonConfig = new JsonConfig();
        jsonConfig.registerJsonValueProcessor(java.util.Date.class,
                new JsonDateValueProcessor());
        if (object != null)
        {
            if (object instanceof Collection || object instanceof Object[])
            {
                jsonString = JSONArray.fromObject(object, jsonConfig)
                        .toString();
            }
            else
            {
                jsonString = JSONObject.fromObject(object, jsonConfig)
                        .toString();
            }
        }
        return jsonString == null ? "{}" : jsonString;
    }

    private static void setDataFormat2JAVA()
    {
        // 设定日期转换格式
        JSONUtils.getMorpherRegistry().registerMorpher(
                new DateMorpher(new String[]
                { "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd" }));
    }

    public static void main(String[] arg) throws Exception
    {
        String s = "[21340771200000,0.0010],[23932771200000,0.0010],[24796771200000,0.0010]";
        System.out.println(" object : " + s);
    }
}